WO2023036907A2

WO2023036907A2 - Cutting load and/or bevel

Info

Publication number: WO2023036907A2
Application number: PCT/EP2022/075056
Authority: WO
Inventors: Zbigniew Noniewicz; Lothar Woick
Original assignee: Wolfcraft Gmbh
Priority date: 2021-09-10
Filing date: 2022-09-09
Publication date: 2023-03-16
Also published as: WO2023036907A3

Abstract

The invention relates to a device for carrying out miter cuts, comprising two limbs (2, 2') which are secured to a central element (1) in a pivotal manner in each case and so as to be fixable in pivoted positions. Each limb (2, 2') has a stop strip (5) with a contact surface (5'), wherein the contact surface (5') lies opposite a counter contact surface (6') formed by a counter stop (6). According to the invention, the distance between the contact surface (5') and the counter contact surface (6') can be adjusted by means of an adjusting element (7, 8, 9). Furthermore, the limbs (2, 2') and the central element (1) are made of plastic, and a region of the central element (1) from which the guide elements (31, 32, 33) originate and which extends at least over the region between the guide elements (31, 32, 33) has either a metal plate (38) or an exchangeable sacrificial plate (38).

Description

box and/or bevel

field of technology

According to a first aspect of the invention, the invention relates to a device for performing miter cuts with two legs which are each pivotably mounted on a central element and can be locked in pivoted positions. The invention also relates to a device with two limbs which are fastened pivotably to a central element and can be fixed in the pivoted position, the limbs each forming a bevel flank.

State of the art

A device of the type described above is known from DE

10 2015 113591 Al known. The device described there has a central element to which two legs are attached. The two legs can pivot against each other by a 90 degree angle. The two long sides of the legs pointing away from each other form bevel flanks in order to tap the angles of two surfaces of a workpiece. A stop bar forms a contact surface for a workpiece that is to be mitred. The contact surface is opposite a counter contact surface. The counter contact surface is formed by a counter stop.

Devices with which miter cuts can be made are also known from DE 114 591 A, DE 35 29855 A1, DE 101 07766 A1, DE 20 2007016 558 U1, US 798,818, US 6,401,584 B1, US 2004/ 0000064 Al and FR 28 17829 Al. [0004] US Pat. No. 5,737,990 A discloses a device in which the legs, starting from a stretched position, can be pivoted by both a positive and a negative angle into an angular position.

GB 305.803 A discloses a miter box with two mutually parallel stops which are acted upon by a tension spring against one another, so that the stops can act as a clamp.

A miter box is known from US Pat. No. 1,850,695, in which a workpiece can be clamped between two clamping jaws, one of the clamping jaws being designed as an eccentric.

GB 2049552 describes a cutting table with a stop bar. A clamp having a threaded shank can be used to clamp a workpiece against the fence.

[0008] US Pat. No. 4,365,531 discloses a saw table in which a clamping element can be adjusted with a threaded spindle in relation to a stop bar.

[0009] US 2008/0041211 A1 describes a saw table with various counter stops with which a workpiece can be pressed against a stop bar.

GB 2366 621 A describes guide pins for guiding a saw blade, which are formed by rotatable round pieces.

[0011] Guide elements for a saw blade are known from EP 0 162402 A1, in which sleeves which can rotate around a shaft are arranged. to the axia Len bondage of the sleeves end portions are provided with increased diameter.

[0012] DE 13 538 A describes a miter saw with two legs which can be pivoted in relation to one another.

[0013] US Pat. No. 3,901,498 A describes a saw table with stops, the stops being slidably attached to angular support bodies. For this purpose, fastening screws are stuck in longitudinal slots of a section of an angle that protrudes vertically from the saw table.

A bevel, in which two mutually pivotable legs each have rails that can be displaced parallel to the bevel flank, is previously known from DE 1 9938426 A1, DE 10 2007003420 A1 and US 2019/0152091 A1.

Summary of the Invention

The object of the invention is to improve the handling of one of the devices described at the outset, namely in particular a device for performing miter cuts or a bevel, or to further develop it in a way that is advantageous in terms of use.

The object is achieved by the invention specified in the claims. The subclaims not only represent advantageous developments of the invention specified in the independent claims, but also independent solutions to the problem. According to a first aspect of the invention, the attachment of a workpiece, for example a profile strip, is to be improved between the contact surface and the counter contact surface. For this purpose, the distance between the contact surface and the counter contact surface should be adjustable by means of an adjustment element. It can be provided that the adjusting element has a rotary knob. The adjusting element can also or additionally have an adjusting spindle with a thread. The adjusting spindle can be rotatably but axially fixed to the leg of the device. The thread of the adjusting spindle can engage in a counter-thread. The counter-thread can be permanently assigned to the counter-stop. It can be provided that the counter-stop has a foot. The foot can protrude into a slot in a bearing surface of the leg. The support surface serves to support the workpiece. Each leg can have a bearing surface. The contact surfaces of the two legs are preferably in a common plane. In the foot of the counter-stop, which can be made of plastic, there can be a cage in which a nut made of metal, for example a square nut, lies. To guide the counter-stop in the direction of the stop bar, edges of the slot can engage in recesses in the foot. Ribs, for example guide ribs, between which the foot is guided can extend below the support surface. In order to mount the adjusting spindle in a rotationally fixed manner on the housing of the leg, the adjusting spindle can have an annular groove. The annular groove can be directly adjacent to a rotary knob which is firmly connected to the adjusting spindle. The housing of the leg can have a recess in which the adjusting spindle is mounted. The recess can have an edge that engages in the annular groove. The recess can be open at the top so that the adjusting spindle can be inserted there. In the installed state, the cutout can be closed by an underside of the stop bar. With such a development, the angle at which a profiled workpiece is inclined relative to the contact surface or the support surface can be adjusted. For example, can an upper edge of the workpiece rests against the contact surface of the stop bar. A lower rear edge of the workpiece may abut against the counter abutment surface of the counter fence. If the counter stop is moved towards or away from the stop bar by turning the rotary knob of the adjusting spindle, the angle at which the workpiece lies in the shaft between the contact surface and the counter contact surface changes.

According to a second aspect of the invention, the range of uses of the device is extended to long workpieces. Support blocks are provided for this purpose. There are preferably two pedestals, each pedestal being attached to the free end of a leg. The support bracket is detachably attached to the free end. In particular, it is provided that the fastening takes place by inserting a projection into a groove. This can be done from the bottom up. The support block can have a dovetail groove at its free end. The projection can have undercut flanks. When the projection and dovetail groove are pushed into one another, the undercut flanks of the projection engage in the undercut groove walls of the dovetail groove. The dovetail groove may be open to an underside of the leg facing away from the bearing surface of the leg. The dovetail groove can only partially extend over an end face of the free end of the leg. It can be closed on its side facing the bearing surface. In a further development it can be provided that the support bracket has a depression flanked by two projections. A surface formed by the indentation is flush with the bearing surface. The support bracket is detachably attached to the leg. If the support block is attached to the leg, it forms an extension of the support surface. If the support block is detached from the leg, it can support the workpiece in a spaced position from the leg. According to a third aspect of the invention, guide elements are attached to the central element, with which a saw or other tool can be guided. The guide elements are each formed by two adjacent guide pins. In order to make it easier to guide the tool, it is proposed that the guide pins have a shank on which at least one sleeve is rotatably mounted. When the tool moves back and forth, the sleeves roll off the broad side surfaces of the tool. In a further development of the invention it can be provided that exactly or at least four guide pins are provided. Provision can also be made for each of the multiple guide pins to carry multiple sleeves. Provision is made in particular for at least one guide pin or each guide pin to carry two sleeves arranged one above the other in the axial direction. It is also contemplated that the sleeves may be rotatably but axially non-displaceably attached to the shank. The sleeves can be made of plastic. The shaft is preferably made of metal. In a development of the invention, it is provided that the sleeve has a cavity into which a projection protrudes, which engages in an annular groove of the shank. The projection can be formed by a spring tongue of the sleeve. The spring tongue may be formed from a cut-away portion of the wall of the sleeve. The spring tongue can sit on a front end of the sleeve.

According to a fourth aspect of the invention, guide elements attached to the central element are provided, between which a gap extends through which a saw blade or the blade of a knife can reach. According to the invention, this distance can be adjusted so that saws with different blade thicknesses or knives with different blade thicknesses can be used. The two guide elements of a pair of guide elements, which are in particular of the same design, can be formed by pins, as have been described above. The pins can have a threaded section with which they are screwed into threaded elements. The threaded elements are, in particular, nuts with an out-of-round outline. The nuts can be inserted in different rotational positions in recesses of the central element. The indentations may be open to the back side opposite the support surface. In the various rotational positions, the axes of the internal threads of the nuts have different distances from one another. The nuts can be polygonal nuts. In particular, it is provided that square nuts are involved. The threaded sections preferably pass through elongated holes in the central element or elongated holes in a sacrificial plate or some other plate that is assigned to the central element. Provision is preferably made for the square nuts to have polygonal flanks running parallel to one another in a first rotational position, in which the distance between the centers of the internal threads of the nuts is small. By turning the shanks, the threaded portions of the shanks can be unscrewed from the nuts. The nuts, which have been detached from the shanks in this way, can be inserted into the depressions in a different rotational position. In this rotational position, polygonal corners of the nuts can protrude over a center line between the axes of the shanks. The depression in which the nuts can lie in the various rotational positions can have a square section, with a free space being provided between the two square sections. Corner recesses are also provided, in which the polygonal corners of the nut can lie in a twisted position. One polygonal section of the nut can reach into the free space in this rotational position. The device preferably has two such pairs of guide elements, the distances between the individual guide elements of a pair of guide elements being adjustable by repositioning threaded elements. The threaded sections preferably pass through oblong holes of the central element.

It is further provided that the legs articulated on the central element from a first perpendicular position in which the contact surfaces form a 90 degree angle to each other, can be swiveled into an extended position. In the extended position, the contact surfaces of the two stop strips lie in a common plane. In order to expand the range of applications of the device, it is proposed that the two legs can be shifted beyond the stretched position to a further right-angled position in which the contact surfaces assume a 270-degree angle to one another. It is thus possible to be able to pivot the legs relative to one another by at least 180 degrees, preferably by at least 190 degrees or 185 degrees. In each of the angles between these two pivoting end positions, the legs can be pivotally blocked on one another or in relation to the central element. It can be provided that the legs each have acute-angled ends. The acute-angled ends have side faces that are at an angle to one another that is no more than 90 degrees. The angle can be less than 90 degrees. In the two pivoting end positions, the side faces of the ends of the legs, which differ from one another, can lie in a position parallel to one another. Provision can furthermore be made for the side walls to have niches at a distance from a pivot axis with which the ends are articulated on the central element. The guide elements enter these niches in the respective swiveling end positions. The ends of the legs have roof-shaped side walls extending towards one another, with the pivot axis being arranged directly adjacent to the top of this roof-shaped arrangement of the side walls, about which the respective leg can pivot relative to the central element.

According to a fifth aspect of the invention, the central element is made of plastic. The legs can also be made of plastic. In order to protect the central element, a metal plate or a sacrificial plate can be located in the area between the two guide elements, ie along the line along which the tool is guided by the guide elements. The metal plate and/or the sacrificial plate can be exchanged be cash. The sacrificial plate can be made of wood or plastic. In the case of an inclined saw, as a result of this configuration, the saw teeth of the saw can engage in the sacrificial plate, which can be replaced when a cut in the sacrificial plate has reached a certain depth. The surface of the central element pointing upwards, to which the legs can also be articulated, can form a depression in which the metal plate or sacrificial plate lies.

According to a sixth aspect of the invention, the device is a bevel or the device can be used as a bevel. Each of the two legs forms a bevel flank which can be applied to a surface of a workpiece or the like in order to tap the angle of the two surfaces by pivoting the legs against one another. In order to improve the range of applications and to simplify the handling of the device, it is proposed that the bevelled flank be formed by a peripheral edge of a rail. The rail can be displaceable in the direction of extension of the beveled flank relative to the leg carrying it. One end of the rail can be attached to the central element. For this purpose, the rail can form a control slot which is at an angle to a slot into which a pin engages in order to attach the rail to the leg. As a result of this mechanical coupling of the rail to the leg and the central element, the rail is displaced when the legs are pivoted.

Each of the two legs forms a rail. The two rails are at different height levels so that they can slide over one another. The rails have free ends which are spaced apart from one another when the legs are in a pivoted position in which the bearing surfaces form a 90-degree angle. In a pivoted position in which the contact surfaces are aligned with one another or in which the contact surfaces are at an angle of more than 180 degrees to one another, the rails can lie one above the other. The edge of the rails can be swiveled through 270 degrees by the two cross the leg at right angles. With these rails not only inner angles but also outer angles can be tapped. The rail or the strip which forms the bevel flank can be fastened with screws or the like to the underside of a body forming the leg. The body can be a hollow body and made of plastic. The body can form an apron that extends parallel to the stop bar and that catches over the rail or bar. Below the skirt there may be a niche in which the bar or rail extends. The housing can support itself with feet on a surface. The rail or strip that forms the bevel flank can be arranged in a downwardly open recess at a small distance above a standing surface of the leg. The bevel flank can run flush with a vertical end wall of the apron or the body.

According to a seventh aspect of the invention, the device should be designed or further developed in such a way that short workpieces can also be cut to length at the various cutting angles. The distance between the two stop bars can be adjusted to reduce the width of the opening between the two stop bars when cutting a 90 degree miter. If the legs are brought into a pivoting position of more than 90 degrees, the stop bars can be spaced apart from one another. The stop bars can be moved so that they touch or almost touch in a 180 degree position. The stop strips are attached to the leg so that they can be displaced and/or relocated in their direction of extension. Fastening elements engage in slotted holes for this purpose. The stop strip preferably has two bores, each of which is engaged by a fastening screw, which each passes through a slot in a housing of the leg. On the side of the bearing surface pointing away from the contact strip, there can be a nut which is non-rotatably mounted in a groove. It can be a square nut. the boh The hole in which the fastening screws are inserted can be a stepped bore. The threaded shank of the screw engages through a lower portion of the bore, which has a small diameter. The head of the fastening screw can rest on a step that extends to an upper section of the bore, which has a larger diameter. Several bores for the fastening screws can be arranged next to one another, so that the displacement distance by which the stop bars can be shifted is increased by relocating the stop bar.

According to an eighth aspect of the invention, the stability of the device is to be improved in the respective pivoted position. For this purpose, two blocking devices are provided with which the pivoting of the legs can be blocked. Each of the two blocking devices can have an actuating element that can be brought from a release position into a blocking position. It is provided that the two legs can only be pivoted against each other when both actuating elements are in the release position. Each of the two legs preferably has an actuating element. With the actuating element, a clamping element can be brought from a clamping position into a release position. Provision can be made for two locking levers to be articulated pivotably on the central element. The locking levers are articulated at a pivot point on the central element, which is offset from the pivot axis of the leg. The locking lever can have an elongated hole through which a clamping screw passes. The actuating element can be a nut and in particular a wing nut which is screwed onto the clamping screw in order to clamp the locking lever. In a further development of the invention it can be provided that the bearing surface forms a recess in which the actuating element is arranged. The height of the actuating element is preferably less than the depth of the recess, so that the actuating element does not protrude into the plane of the support surface. The actuating element can thus locally also there be arranged where a workpiece can be supported during use of the device. The actuating element can preferably even have a smaller distance from the contact surface than the maximum distance between the counter contact surface and the contact surface.

[0026] The central element can have a central area having a substantially circular or oval outline. The two legs are articulated with their pivot axes on this central area. One arm can protrude from the central area in a diametrically opposite position. A guide element for guiding the saw is arranged at the end of each arm. A metal plate, which forms a swivel arm, can extend on the underside of the housing forming the leg. The swivel arm is attached to the swivel bearing and has teeth there that extend over a semicircle. The toothing of the two pivoting arms intermesh so that the two legs pivot synchronously with respect to the central element. The ends of the swivel arms opposite the teeth are fastened to the plastic housing of the respective leg. On the one hand, the leg can be lengthened with the support bracket that is detachably attached to one leg. On the other hand, the support block can also be used as a carrier for long workpieces in a remote position from the leg. With the projection engaging in a dovetail groove, the support bracket can be connected to the free end of the leg by a sliding movement.

By the support block having a depression flanked by two humps or projections, the workpiece can rest securely on the support block when it engages in the depression. By the sleeve having a spring tongue at one end, which engages in an annular groove of the shank, the head section on the shank, which has a larger diameter than that required in the prior art, can be dispensed with. The sleeve is connected to the shank by a snap-in connection, which extends between the inner wall of the sleeve and the outer surface of the shank. This also makes assembly easier.

By being fixed with a detachable connection on the leg in a device for performing miter cuts, the stop bar with holes in the stop bar and elongated holes of the leg through fasteners, the stop bars can be offset laterally. Since the elongated holes extend in the support surface, an angular holder is not required. There are preferably no other means protruding from the support surface, with which the stop bar is fastened.

It is also advantageous if the actuating elements for determining the pivoted position of the two legs are each arranged in a depression in the bearing surface. It can then be actuated from above, although the entire surface is available to support a workpiece.

The development of a bevel according to the invention provides that the rail is coupled to a leg in such a way that pivoting of the leg moves the rail. The rail thus moves automatically when changing the angle. It is also advantageous if the rail is fastened both to the leg and to the central element. This coupling to two mutually movable parts allows the rail to move when pivoting. Brief description of the drawings

An embodiment of the invention is explained below with reference to the accompanying drawings. Show it:

1 a perspective view of a cutting box,

2 shows an enlarged section II of FIG. 1 with openings,

3 shows the cutting box in a view from below in a stretched position of the two legs 2, 2',

4 shows the section according to line IV-IV in FIG. 3,

5 shows the section along line V-V in FIG. 2, FIG. 5a shows the section along line Va-Va in FIG. 5,

6 shows the section along the line VI-VI in FIG. 2,

Fig. 7 is a plan view of the cutting box in a 90 degree position of the two legs 2, 2',

8 shows a bottom view of the cutting box in the position shown in FIG. 7,

Fig. 9 is a plan view of the cutting box in a 270 degree position of the two legs 2, 2', 10 is a bottom view of the cutting box in the position shown in FIG. 9,

Fig. 9a enlarges the section along the line IXa-IXa in Figure 9,

11 shows the cutting box in an operating position for cutting a 90 degree miter, with a counter stop 6 being at a first distance from a stop bar 5,

12 shows the cutting box in a different operating position for making a right-angled cut, the counter-stop 6 having a reduced distance from the stop strip 5, FIG. 13 enlarges section XIII in FIG. 10,

Fig. 14 shows the section according to the line XIV - XIV in Fig. 13,

Fig. 15 shows the section according to the line XV - XV in Fig. 14,

16 shows a representation according to FIG. 13, in which square nuts 58, which lie in polygonal recesses 59, have been twisted and

Fig. 17 shows the section according to line XVII - XVII in Fig. 16.

Description of the embodiments

The tool shown in the figures is on the one hand a cutting box with which workpieces 50 can be cut, the angle of the Section by pivoting two legs 2, 2 'relative to a central element 1 can be adjusted.

On the other hand, the tool is also a bevel with which an angle of two surfaces of a workpiece or a building wall or the like can be tapped.

The tool shown in the figures is particularly preferably a combination of a cutter box and a bevel, in which the angle can be tapped with two bevel flanks 3 and in which two stop strips 5 are brought exactly into the angle when tapping the angle in order to be able to cut a miter angle on a workpiece that corresponds to the tapped angle.

A central element 1 has a central area with a substantially circular outline and is formed by a hollow body made of plastic. The central area is adjoined by opposite arms, each of which carries two guide pins 31 that are close together. Two guide pins 31 together form a guide element for guiding a tool 49, for example a saw. The guide pins 31 have shanks 33. The shanks 33 have a circular cross-section and are made of metal. Each shank 33 supports at least one sleeve 32. In the exemplary embodiment, each shank 33 supports two sleeves 32 which are arranged axially one behind the other and which can rotate about the shank 33.

The sleeves 32 are rotatable but axially fixed to the shaft 33 (see Figure 5a). The sleeves 32 made of plastic or an easily machinable material each have two parallel incisions at one of their free ends, which are open towards the end of the sleeve 32 . Between the two A spring tongue 34 extends through incisions and forms a projection 34' projecting into the cavity of the sleeve 32. The metal shank 33 has an annular groove 54 into which the projection 34' engages in order to hold the sleeve 32, which can be rotated about the shank 33, on the shank 33 in a detachable manner.

The surface of the central element 1 pointing upwards in the position of use has an insert 38 made of wood or of an easily machinable material or of metal (see FIG. 9a). The insert can form a sacrificial plate that can be replaced. However, the insert can also form a protective plate made of metal or the like. The insert 38 can rest in a recess 39 .

Two legs 2, 2' are articulated on the central element 1 in a symmetrical manner. The legs 2, 2' are articulated on the central element in such a way that they are pivoted from a 90 degree position shown in FIGS. 7 and 8 via a 180 degree position shown in FIG. 3 to a 270 degree position shown in FIGS can become. For this purpose, the two legs 2, 2' are each connected to the central element 1 via pivot bearings, each having end sections 35 which are at an acute angle to one another. The pivot bearings form pivot axes 30 about which the legs 2, 2' can be pivoted.

In the two pivoting end positions, the side walls 35' of the acute-angled end 35 of the two legs 2, 2' can run parallel to one another. They may be spaced apart so that a saw blade can pass between adjacent side walls 35'. The side walls 35' each have niches 36, 37 into which the guide elements 31, 32 can enter in the two swiveling end positions (FIGS. 7, 8; FIGS. 9, 10).

The legs 2, 2 'are each formed by hollow bodies made of plastic. The hollow bodies, which are open at the bottom, form a cavity 18 . A swivel arm 28 made of metal is fastened in the cavity 18 . The pivot arm 28 extends with an end section that is toothed over a semicircle to below the acute-angled end 35 and also forms part of the pivot bearing, so that the pivot axis 30 extends through the center point of the two toothings 29 that extend over a semicircular arc and that mesh in order to to synchronize the pivoting movement of the two legs 2, 2'.

At a distance from the pivot axes 30 are approximately the same distance at which the two pivot axes 30 are spaced apart, pivot bearing 27 is provided, on which locking lever 26 are attached. The locking levers 26 each have a slot 51 and extend over a large part of the length of the legs 2, 2'. Clamping screws 25 engage in the elongated holes 51, with which the locking levers 26 can be clamped to the housing of the legs 2, 2'.

The clamping screw 25 pass through an opening in the housing wall of the leg 2, 2'. A fastening element, for example in the form of a wing nut 23 , is screwed onto a threaded shank of the clamping screw 25 . The wing nut 23, for example, is supported on a washer. The fastening element is arranged in a recess 24 . A total of two or at least two clamping screws 25 are provided, one of the two legs 2 , 2 ′ relative to the central element 1 being individually pivotally lockable with each of the two clamping screws 25 . However, since the two legs 2, 2' are mechanically coupled to one another via interlocking teeth 29, the two legs 2, 2' can only pivot in relation to one another if both clamping screws 25 are loosened at the same time.

On their side pointing upwards in the operating position, the legs 2, 2' form bearing surfaces 10 which are aligned with one another and on which a workpiece 50 to be cut can be placed. The depression 24 extends at a lower level than the contact surfaces 10 in such a way that the fastening element 23 does not protrude beyond the plane in which the contact surface 10 extends. The depression 24 extends in an area onto which a workpiece 50 can be placed during use of the device.

Each of the two legs 2, 2' has one or at least one stop rail 5 with a contact surface 5' for contacting a workpiece or an edge of a workpiece 50. The contact surface 5' is at a right angle to the support surface 10. The contact surface 5' is assigned one or at least one counter contact surface 6' opposite it. The counter-abutment surface 6' is formed by one or at least one counter-stop 6, on which another edge of the workpiece 50 can be supported.

The stop bar 5 has an upper long narrow side and a lower long narrow side. Bores for inserting a fastening screw extend in the two narrow sides. The stop bar 5 also has short narrow sides. A short narrow side extends at right angles to the contact surface 5'. The other short narrow side extends obliquely running to the contact surface 5', the angle of inclination which the short narrow side has to the contact surface 5' can be 45°. At least two bores are preferably provided, these two bores being arranged in the region of the respective end of the long narrow sides. The bores can have the same or a similar distance to the short edge of the contact surface 5'.

The counter stop 6 can be displaced in such a way that the distance between the contact surface 5' and the counter contact surface 6' can be adjusted. For this purpose, an adjustment device is provided, which can be actuated via a rotary knob 8 .

The adjusting device has an adjusting spindle 7 which extends in the adjusting direction transversely to the extent of the contact surface 5 ^Z and has an external thread. A collar which forms an annular groove 12 adjoins the turning knob 8 , which is firmly connected to the adjusting spindle 7 . The annular groove 12 is mounted in a recess 13 (see Figure 2). The recess is open towards the top, ie towards the support surface 10, and is closed by the stop strip 5 which is detachably fastened to the leg 2, 2'.

Above the adjusting spindle 7, parallel to the adjusting spindle 7, there is a slot 11 in the support surface, the slot width of which is greater than the diameter of the adjusting spindle 7. The counter-stop 6 is guided in the slot 11. For this purpose, the counter-stop 6 has recesses 14 (see FIG. 4), in each of which an edge of the slot engages.

The counter-stop 6 forms a foot 6" which is arranged below the level of the bearing surface 10 and in which there is a cage 16 which receives a nut 9, in particular a square nut 9. The thread is in this nut 9 screwed into the adjusting spindle 7. The two side surfaces of the foot 6" pointing away from one another can touch ribs 15, which on the one hand can serve to stiffen the housing of the legs 2, 2', but on the other hand can also form a guide function for the counter-stop 6.

The function of the counter-stops 6 can be described with reference to FIGS. 11 and 12. FIG. FIG. 11 shows a workpiece 50 in the form of a profile strip which has an upper edge which is supported on the contact surface 5' and which has a lower edge which is supported on the counter contact surface 6'. The workpiece 50 is thus held in an angular position between the two surfaces 6', 5'. If the distance between the two surfaces 5′, 6′ is changed, the angular position of the workpiece 50 changes, and with it the spatial angle at which the cut is made with the saw 49.

The two legs 2 , 2 ′ form end faces 19 on their side pointing away from the central element 1 . The end faces are formed by the free ends of the legs 2, 2'.

On the end faces 19 there is a dovetail groove 21 which is open towards the bearing surface 10 but closed at the bottom.

Two support blocks 20 are provided, which can be used as additional support means for supporting the workpiece 50 (see FIG. 11) or which are detachably attached to the free end 19 or the end face (see FIG. 12). A projection 22 with undercut side surfaces which can be inserted into the dovetail groove 21 protrudes from a broad side surface of the support block 20 . Other means for detachably fastening the support bracket 20 to the end faces 19 can also be provided, for example, a spigot may latch into an opening. It is also provided that the support bracket 20 is fastened to the leg 2, 2' with a detachable threaded connection, in particular a screw.

The upwardly pointing upper side of the support block 20 forms a central region which has the same height from a floor level as the support surface 10 also has. The central area is flanked by two humps 53, the distance between which can be the maximum distance between the counter-stop 6 and the stop bar 5. The two support blocks 20 can be formed by hollow bodies made of plastic.

The maximum distance of the counter-abutment surface 6' from the abutment surface 5' is greater than the minimum distance of the recess 24 from the abutment surface 5'. This allows a tool to be cut to freely extend over the indentations 24 .

The bevel flanks 3 of the device are formed by rails 40 which extend in the lower area of the legs 2, 2'. They are connected to the leg 2, 2' in the region of the rear side of the leg 2, 2' pointing downwards. The beveled flanks 3 extend parallel to the longitudinal side of the housing of the leg 2, 2'. The bevel flanks 3 formed by the edges of the rails 40 can lie flush in the longitudinal sides of the housing.

The rails 40 have two oblong holes 41, one behind the other in the direction in which the rails 40 extend, into which pins 42 engage, with which the rail 40 is connected to the respective leg 2, 2'. The rails 40 can be made of metal. An end of the rail 40 pointing towards the central element 1 forms a control slot 43 which runs at an angle to the elongated holes 41 and into which a control pin 45 which is connected to the central element 1 engages. When the legs 2, 2' pivot relative to the central element 1, the control pin 45 can move in the control slot 43 in order to displace the rail 40 in the direction of its extension relative to the leg 2, 2'. In the process, end sections 44 of the rails 40 move towards one another or away from one another. In the 90 degree position of the two legs 2, 2' shown in FIGS. 7 and 8, the end sections 44 are at a maximum distance from one another. In the stretched position shown in FIG. 3, in which the legs 2, 2' form an angle of 180 degrees to one another, the tips of the end sections 44 lie one above the other, which is a result of the slight height offset of the two rails 40. The two rails 40 are offset in height by their material thickness on the legs 2, 2 'attached.

If the legs 2, 2' are displaced further in the direction of the 270 degree position, the end sections 44 slide further over one another until the marginal edges of the rails 40 intersect at right angles in the 270 degree position shown in FIGS.

Along with the pivoting of the legs 2, 2' from the 90 degree position to the 270 degree position, the rails 40 move in the direction of the free end 19 of the leg 2, 2'.

The stop bars 5 can also be made of plastic. However, the stop strips 5 are preferably also made of wood. On their mutually facing sides, the stop strips 5 have obliquely cut narrow sides which are at a distance from one another which decreases when the legs 2, 2' move from the 90 degree position to the 270 degree position to be brought. In order to be able to set an optimum width of the slot between the two stop strips 5, the stop strips 5 are arranged such that they can be displaced or displaced relative to the legs 2, 2'.

FIG. 2 shows fastening screws 52 which are inserted in bores 48 in stop bar 5 . A total of two fastening screws 52 are provided for each stop bar 5 . The threaded shanks of the fastening screws 52 reach through elongated holes 47 extending in the bearing surface 10 and are each screwed into a nut 46, the nut 46 being able to be a square nut. The clamping function can be canceled by loosening the fastening screws 52, so that the contact strip 5 can be displaced in the direction in which it extends.

The hole in which the fastening screw 52 is located has a large-diameter portion 48 'which is open to the long side. In particular, two large-diameter sections 48' are provided for each bore, so that the stop bar 5 can also be used in an upside-down position. The stop bar 5 is thus assigned to the leg 2, 2 'turnable. A section 48 which has a smaller diameter extends between the two large-diameter sections 48', so that the head of the fastening screw 52 can be supported on the step between the section 48 of the bore and the upper bore section 48'.

The elongated hole 47 provides only a limited way by which the stop bar 5 can be moved. In order to move the stop bar 5 by a larger amount, the fastening screw 52 can be completely detached from the nut 46 and inserted into an adjacent bore 48. By relocating the mounting screw 52 from a first hole 48 the width of the slot between the two stop strips 5 can thus be gradually changed in one of these immediately adjacent second bores 48 .

FIGS. 13 to 17 show guide elements 31, which are adjustable with regard to their distance x, y, and which serve to guide a saw or a knife with which a miter cut can be produced in a workpiece using the device. The distance between the two guide elements and in particular between the sleeves 32 can have the small distance x shown in FIGS. 13 and 14 or the large distance y shown in FIGS.

The central element 1 has slots 57 through which a threaded section 66 of a shank 33 of the guide elements 31 can reach. An optionally provided sacrificial plate 38 or metal plate 38 can have congruent elongated holes 56 through which thread sections 66 pass.

The shanks 33 have a circular-cylindrical peripheral surface in an area adjacent to the threaded sections 66 . Smaller-diameter thread sections 66 protrude from this circular-cylindrical lower section of the shafts 33, so that steps are formed with which the shafts 33 can be supported on the surface of the plate 38 pointing upwards.

The underside of the central element 1 has two depressions 55 arranged next to one another, which are connected to one another by a free space 65 . Each of the two indentations 55 forms a polygonal recess 59 . The polygonal recess 59 forms a first profile section 60, which is a square profile section in which a square nut 58 is non-rotatably recording in a first rotational position, in which the axes 61 of the shafts 33 have a small distance x. The square profile section 16 forms three corner recesses 62, into which the polygonal corners of the polygonal nut 58 can engage in a rotationally fixed position, as shown in FIGS. 16 and 17. In this position, the center points 63 of the squares defined by the corner recess 62 are at a greater distance than the center points 61 of the squares defined by the square profile sections 16 .

It can be seen from FIG. 16 that the rotational position there is angularly offset by less than or more than 45° compared to the rotational position shown in FIG. In the rotational position shown in FIG. 16, corner areas 64 of the nuts 58 project beyond a center line M between the guide elements 31. The center line M represents the path of movement of a tool which is used to divide a workpiece using the device.

To convert the guide elements 31, the shafts 33 are rotated about their axis. For this purpose, the front ends of the shafts 33 opposite the threaded sections 66 can have screwing tool engagement openings. By rotating the shanks, the threaded sections 66 are unscrewed from the internal threads of the nuts 58 so that the nuts can be rotated by an angular amount after removal from the recess 55, which in the exemplary embodiment can be less than 45°.

[0075] The above explanations serve to explain the inventions covered by the application as a whole, which also represent the state of the art independently, at least through the following combinations of features dig, whereby two, several or all of these feature combinations can also be combined, namely:

A device which is characterized in that the distance between the contact surface 5' and the counter contact surface 6' can be adjusted by means of an adjustment element 7, 8, 9.

A device which is characterized in that the adjusting element 7, 8, 9 has an adjusting spindle 7 which can be rotated by a rotary knob 8 and which is rotatably but axially fixed to the leg 2, the thread of the adjusting spindle 7 engaging in a nut 9 , Which is mounted in a foot 6" of the counter-stop 6, which foot 6" protrudes into a slot 11 in a bearing surface 10 of the leg 2.

A device which is characterized in that edges of the slot 11 engage in recesses 14 of the foot 6" and/or that the foot 6" is guided between two ribs 15 extending below the bearing surface 10 and/or that an annular groove 12 of the adjusting spindle 7 rests in a recess 13 of the leg 2, 2' that is open on one side, which recess 13 is closed by an underside of the stop strip 5, and/or that the annular groove 12 is directly adjacent to the rotary knob 8.

A device for performing miter cuts with two legs 2, 2′ each pivotably fastened to a central element 1 and lockable in pivoted positions, each leg 2, 2′ having a free end 19 to which a support block 20 is detachably fastened.

A device, which is characterized in that fastening means with which the support bracket 20 is attached to the free end 19, a Have a dovetail groove 21 into which a projection 22 having undercut flanks engages.

A device which is characterized in that the dovetail groove 21 is open on the underside of the leg 2, 2' pointing away from a bearing surface 10 of the leg 2, 2' and is closed on its side pointing towards the bearing surface 10.

A device which is characterized in that the support bracket 20 has a depression (55) flanked by two bumps or projections 53, which is aligned with a support surface 10 when the support bracket 20 is in a position attached to the leg 2, 2'.

A device which is characterized in that the legs 2, 2') and the central element 1 are made of plastic and an area of the central element 1, from which the guide elements 31, 32, 33 originate and which extends at least over the area between the guide elements 31, 32, 33, either a metal plate 38 or a replaceable sacrificial plate 38 has.

A device which is characterized in that the metal plate 38 or sacrificial plate 38 lies in a depression 39 of the central element 1 and/or that the metal plate 38 or sacrificial plate 38 has openings through which pivot axes 30 extend, with the ends 35 the legs 2, 2' are articulated pivotably on the central element 1.

All features disclosed are (by themselves, but also in combination with one another) essential to the invention. The disclosure content of the associated/attached priority documents (copy of the previous application) included in full, also for the purpose of including features of these documents in the claims of the present application. The subclaims characterize, even without the features of a referenced claim, with their features independent inventive developments of the prior art, in particular for making divisional applications on the basis of these claims. The invention specified in each claim can additionally have one or more of the features specified in the above description, in particular with reference numbers and/or specified in the list of reference numbers. The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are evidently dispensable for the respective intended use or can be replaced by other technically equivalent means.

List of References

1 central element 23 actuating element, wings

2 leg nut

2' leg 24 recess

3 Forged flank 25 clamping screw

4 rear flank 26 locking lever

4' rear flank 27 pivot bearing

5 stop bar 28 swivel arm

5' contact surface 29 teeth

6 counter stop 30 swivel axis

6' abutment surface 31 pilot pins

6" foot 32 sleeve

7 adjusting spindle 32' front end

8 Knob 33 Shaft

9 nut 34 spring tongue

10 bearing surface 34' protrusion

11 slot 35 acute end

12 annular groove 35' side wall

13 recess 36 niche

14 recess 37 niche

15 rib 38 sacrificial plate, metal plate

16 cage 39 recess

17 side panel 40 rail

18 cavity 41 slot

19 free end, face 42 spigot

20 support block 43 control slot

21 dovetail slot 44 end section

22 boss 45 control pin

46 mother 7 oblong hole 8 bore 8' upper bore section

49 saw

50 workpiece

51 slotted hole

52 fastening screw

53 cusps

54 ring groove

55 deepening

56 slotted hole

57 slotted hole

58 square nut

59 Polygonal recess

60 square profile section

61 midpoint

62 corner recess

63 midpoint

64 corner

65 free space

66 thread section x distance y distance

M center line

Claims

32

Expectations:

1. Device for performing miter cuts with guide elements (31) attached thereto, each of which is formed by two adjacent guide pins (31), the guide pins (31) having a shaft (33) on which at least one sleeve (32) can be rotated is mounted, characterized in that the sleeve (32) has a spring tongue (34) which engages with a projection (34') in an annular groove (54) of the shaft (33).

2. Device according to claim 1, characterized in that several sleeves are arranged axially one behind the other on a shaft (33) and/or that the sleeves (32) are made of plastic.

3. Device according to one of the preceding claims, characterized in that the spring tongue (34) is assigned to a front end (32) of the sleeve (32) and/or extends between two incisions open from the front end (32) and/or that the projection (34) is arranged at the free end of the spring tongue (34).

4. Device according to one of the preceding claims, characterized in that the guide element (31) is assigned to a central element (1) to which two pivotable legs (2, 2') which can be fixed in pivoted positions are fastened.

5. Device for performing miter cuts with two legs (2, 2') each pivotably attached to a central element (1) and lockable in pivoted positions, each leg (2, 2') having a free end (19) on which the detachable a trestle (20) is attached, characterized in that fastening means with which the trestle (20) 33 is attached to the free end (19), have a dovetail groove (21) into which a projection (22) having undercut flanks engages. Device according to Claim 5, characterized in that the dovetail groove (21) is open to the underside of the leg (2, 2') pointing away from a bearing surface (10) of the leg (2, 2') and to its underside pointing to the bearing surface (10). page is closed. Device for carrying out miter cuts, with two legs (2, 2') each pivotably fastened to a central element (1) and fixable in pivoted positions, each leg (2, 2') having a free end (19) on which a support block ( 20) is fastened, characterized in that the support bracket (20) has a depression (55) flanked by two humps or projections (53) which, in a position in which the support bracket (20) is fastened to the leg (2, 2') has a Support surface (10) is aligned. Device for performing miter cuts with guide elements (31, 32, 33) attached thereto for guiding a saw, one or more bodies of the device being made of plastic and a region of one of the bodies from which the guide elements (31, 32, 33) originate at least over the area between the guide elements (31, 32, 33), either a metal plate (38) or an exchangeable sacrificial plate (38) _r the metal plate (38) or sacrificial plate (38) in a recess (39) of the central element (1) and has openings through which pivot axes (30) extend, with which ends (35) of the legs (2, 2') are pivotably articulated on the central element (1). Device for carrying out miter cuts with two legs (2, 2') each pivotably attached to a central element (1) and fixable in pivoted positions, wherein the central element (1) has two guide elements (31), characterized in that the distance (x, y) between the guide elements (31) is variable. Device according to Claim 9, characterized in that the guide elements (31) each form a shank (33) which is screwed into a nut (58) with a threaded section (66). Device according to Claim 10, characterized in that the threaded section (66) is inserted in an out-of-round nut (58) which can assume different rotational positions in an out-of-round recess (59), the guide elements (31, 32, 33) in the different rotational positions have different distances (x, y) from one another. Device according to Claim 11, characterized in that in a first rotational position of the nuts (58) having a polygonal outline, polygonal flanks of the nuts (58) run parallel to one another and in a second rotational position, polygonal corners (64) protrude beyond a center line (M) between the two guide elements . Device according to one of Claims 5 to 12, characterized by at least four guide pins (31), which each carry two sleeves (32) arranged one above the other in the axial direction, the sleeves (32) being fastened to the shaft (33) in a rotatable but axially non-displaceable manner and/or that the sleeves (32) are made of plastic and the shaft (33) is made of metal. Device according to one of the preceding claims, characterized in that the legs (2, 2 ') from a first right-angled position, in which the contact surfaces (5') at a first 90 degree angle to each other, are pivotable into a stretched position in which the contact surfaces (5') are aligned with one another, and the legs (2, 2') can be pivoted beyond the extended position into a second right-angled position in which the contact surfaces (5') are at an angle of 270 degrees to one another. Device according to one of the preceding claims, characterized in that the central element (1) forms two pivot axes (30) on which acute-angled ends (35) of the legs (2, 2') are articulated pivotably on the central element (1), side walls ( 35') of the acute-angled ends (35) run at an angle of no more than 90 degrees to one another or less than 90 degrees to one another and/or that the side walls (35') have niches (36, 37) in a region remote from the pivot axis (30) into which guide elements (31, 32) enter in the first perpendicular position or the second perpendicular position. Device for carrying out miter cuts, having two legs (2, 2') which are fastened pivotably to a central element (1) and can be locked in pivoted positions, each leg carrying a stop bar (5) with a contact surface (5') which is displaceable and displaceable in its direction of extension / or is attached to the leg (2, 2') in a displaceable manner, with fastening elements (52) reaching through the stop strip (5) with bores (48) in the stop strip (5) and oblong holes (47) in the leg (2, 2'). with a detachable connection (52, 46) on the leg (2, 2') 36 is strengthened, characterized in that the elongated holes (47) extend in the bearing surface (10). Device according to Claim 16, characterized in that the stop bar (5) can be turned around an axis parallel to the direction of extension of the leg (2, 2') and/or around an axis perpendicular thereto. Device according to one of Claims 16 or 17, characterized by bores (48) which are arranged next to one another in pairs and which can be selectively inserted into a fastening screw (52). Device according to Claim 18, characterized in that the bores (48) have sections (48 ^z ) of increased diameter on both of their opening sides. Device according to one of Claims 10 to 19, characterized in that the bores (48) extend between two narrow longitudinal sides of the stop strip (5). Device for performing miter cuts, having two legs (2, 2') each pivotably fastened to a central element (1) and fixable in pivoted positions and having a blocking device with which the pivotability of the legs (2, 2') can be blocked, the blocking device an actuating element (23) which can be brought from a release position into a blocking position, each leg (2, 2') having a bearing surface (10) for bearing a workpiece, the two bearing surfaces (10, 10 ^z ) of the two legs (2, 2 ^Z ) in one 37 are common plane, characterized in that the actuating elements (23) are arranged in a recess (24) of the bearing surface (10) and do not protrude beyond the bearing surface (10).

22. The device according to claim 21, characterized in that the actuating element (23) is a nut which is screwed onto a clamping screw (25) which engages in a slot (51) of a locking lever (26) whose fixed end is a pivot bearing (27) is attached to the central element (1).

23. Device according to one of claims 16 to 22, characterized in that the stop strip (5) has two opposite long narrow sides in which the bores (48) are arranged and two opposite short narrow sides, one narrow side being inclined to the contact surface (5') and the other at right angles to the contact surface (5'). 24. Device according to one of claims 14 to 23, _{characterized} in that bores (48) for receiving fastening screws (52) are spaced approximately the same further from a narrow edge of the contact surface (5').